Well, I just now finished up making the stock specs, hope everything is in order.

Common Design

All MJs were built as a full unibody design with the body and frame rails tied/welded together as one piece and cannot be removed, however, the rear is a fully boxed frame with the bed bolted to it, making the bed removable. All MJs have solid axles front and rear. The suspension consists of coils for the front and leaf springs for the rear. All MJs came with disc brakes in the front and drums in the rear.

Also, all MJ's through all years are equipped with a height sensing proportioning valve that is used to change the bias of the brakes if the bed had a load in it.

For those curious to the differences in Cherokee's and Comanche's:

The taillight lenses are different from a Cherokee's, the wheel flares are the same (as a 2dr Cherokee), the front doors off of 4-door XJ's (84-92 at least) are swappable, hoods are swappable from 84-92 models Cherokee's (Cherokee's above 92 used spring-loaded hinges), and all mechanical/electronic parts forward of the firewall ARE identical.

Body

The body comes only in standard cab model with a rear double-top hatch tailgate. Comes in longbed or shortbeds two-tone versions. Long bed versions come with a larger gas tank than the short bed and is located front of the axle. Short bed version was not avaiable in 1986.

Interior: Door panels are removable as stock. Bench seats and bucket seats DO NOT have the same mounting brackets as XJ seats. Gauge cluster is removed by 4 screws. Gauge cluster during 86' have mechanical-powered gauges. On 87-90 gauges, The speedometer uses a cable, but all gauges 91-92 use a computer cable.

Fuel Miser package was available, lowering the HP
to 100hp and included a 4 speed manual trans, no tail gate, undercoating, and 3.31 axle gears. the 4x4 Miser got the same treatment as well as no spare tire or brackets.

Automatic Transmissions
Torqueflight 904 - 3 speed automatic - used only in 86 with 2.8L V6 and 2.5L I4 engines and 2.8L turbo-diesels
AW4 - 4 speed automatic, electronically controlled - manufactured by Aisin - used from 87-92 (87-92 models include a Power/Comfort button that adjusts the shift points, also known as a towing package; all transmissions came with the towing package and came with a transmission cooler; 88+ models used Power/Comfort switch for off-roading)

Pete M implied information about this that might override anything written above, where his information is correct. It was too hard for me to take his info and add it in, atleast for now...

Quote:

Originally Posted by Pete M

The "Metric Tonne" or "Big Ton" or "payload package" was designed for hauling, was only available on longbeds, and consisted of an AMC-20 rear axle in 86, Dana 44 rear axle in 87-92, heavier duty springs front and rear, tougher shocks, the larger tires, fullsize spare and 15x7 wheels. In the AMC-20, the only gear ratio was 4.10, Dana 44s got stuck with the standard ratio available with the specified drivetrain combo (3.08 for 4.0l/manual, 3.54 for 4.0l/autos, and 4.09 for 2.5l/manuals).

Front Driveshaft - On 86-87 MJs (NP207 t-case) the front shaft is a "GKN" style shaft. On 87-92 MJs (NP231/242 t-case) the front is a "double cardan" two-piece driveshaft with a CV joint at the transfer case end.

Rear Driveshaft - The rear is a one-piece shaft with standard u-joints at both ends. The slip yoke is located on the output shaft of the transfer case. On 86-92 models, the yoke slides in and out of the transfer case and is lubricated by the ATF fluid internally.

This information might override what's written on the rear-driveshaft, but has no method of being added in as 'stock'

Quote:

Originally Posted by Pete M

Actually, there were 2 different styles of rear shaft offered, though I have yet to determine a logical pattern behind which MJ got which. The other one was a 2-piece design, but not the usual 2-piece you're thinking of where one side slips on the other. The MJ 2-piece had a large outer tube on the transmission side and a smaller tube on the axle side. They are fused together with a thick rubber isolator designed to reduce vibrations.

3.07 - used with 4.0L engine / manual transmission
3.31 - used with 2.5L Fuel Miser option
3.55 - used with 4.0L engine / automatic transmission
4.10 - used with 2.5L engine usually
4.56 - rare but can be found on some older (~ 89 ~) models with 2.5L engine and auto transmission

NOTE:Cooling Systems

Open style - any normal cooling system used today. Opposite of closed style described below.

Closed style - has no radiator cap and utilizes a pressure bottle. This style cooling system was used in 87-90 MJs.

Overall length was 179.3" for shortbeds, 194.0" for longbeds
Overall curb height was 63.7" for 2wds, 64.7" for 4wds
Track width was 57" with the 15x6 rims, 58" with the 15x8s
Body width at the rear flares was 71.7"
Length of inside of box at the floor was 73.7" sb and 88.5" lb
Width of box at the floor is 55.3" for both sb and lb
Width between wheel wells is 43.8"
Box depth is 16.4"

This is a edited copy of the XJ stock specs. If anything here is incorrect or if you would like to add the dimensions and production numbers, please post info :thumbsup:

The OTHER notes section!!!

Quote:

Originally Posted by Pete M

Curb weight for the 2wd short bed was 2912
4wd sb was 3076
2wd lb was 2959
4wd lb was 3141

Payload for stock MJs is 1475 lbs (1200 for 86), Metric Tonne was 2205 lbs. The maximum tow rating an MJ was ever given was 5000 lbs (4.0L required). 2.5Ls seem to have been limited to 2000 lbs and 2.8Ls were 4200. I cannot find any rating listed for the stock bumper. Every brochure mentions a class 1,2,3 hitch needs to be installed for towing.

You missed the Metric Ton paskage which used the D44 in the rear. You also forgot to mention that the 90-92 had a height snsing proportioning valve that was used to change the bias of the brakes if the bed had a load in it. You also forgot the long and short bed. As for the trim levels youy forgot the eliminator, or the Sport Truck. You also forgot to mention the fact that there was 2 different size gas tanks, and that the rear axle is a spring ubder axle design. Besides fron all those things good post. :thumbsup:

Patrick

krodeMJ

02-05-2005 02:49 PM

I don't know a lot about stock specs for the MJ, and mine was purchased from someone who didn't know a lot either. However my MJ seems to conflict with the stock specs you listed. I'm trying to find out more about mine to begin with, but this is what I know so far. It seems to be a base Comanche, however is it possible it has a towing kit? How would I check (theres a tow hitch, but that doesn't tell me much.)

No other special features as far as I can tell. It's not a long box, and it's the original dark maroon color.

Can anyone tell me anything else about it knowing that information, or where to look on the jeep? I had found an online VIN decoder for the Comanche, but not having much luck finding it again (could swear I bookmarked it...)

cj7xjmj

02-05-2005 03:52 PM

I found my build sheet on my 90 MJ behind the drivers side door panel, and one Under the seat, not that I was looking for them. I was pulling out the bench seat to replace them with buckets, and The door panel was coming off so I could replace the window regulator.

Patrick

Country Jeep

02-05-2005 05:02 PM

Alright, changes made. And krodeMJ, I can't seem to find any info about a towing "kit". I'll keep looking...anybody know about a towing "kit"?

Alright, any problems or information I need to fix or add?

krodeMJ

02-05-2005 06:19 PM

Sorry, I'm not sure if it's called a towing kit/package, but I've seen the reference around some places. It may refer to what I've also seen called the 'metric ton package'. Not sure of what it's supposed to be called, or include, but I know one of the features of that option is different gearing in the rear differential.

Country Jeep

02-05-2005 09:37 PM

Well I wouldn't want to be reposting info on that but.......but the towing package IS the power-comfort switch, but I'm still not sure about the metric-ton package. It might be different, I'll study up on it. But cj7xjmj, what exactly do you mean by metric-ton package? That switch on ur dash?

cj7xjmj

02-06-2005 07:33 AM

The metric ton package was an option for the MJ. It included the D44 rear, and a few other things, I am not sure of all the items cause they are extremely rare. The power comfort switch came on almost all the early model AW4 trannies.

The towing package included a transmision cooler and 3.73 gears.

Patrick

MJDriver

02-06-2005 09:09 AM

The towing package pretty well consisted of the power switch on the dash. When it is switched on it flows more fluid and thus helps it lockup better. I think a read the hitch and trailer light relay were actually optional.

I haven't confirmed it, but I think I have the metric ton package. I've got a longbed with a D44 rear and the power button, but no wiring in the back for a trailer.

PS. On the specs I think the HO engine came out in '91, and the gas tank is always located in front of the rear wheel.

Country Jeep

02-06-2005 09:28 AM

Alright, I've studied up on all of this and listen to ya'll

Towing Package: Known as the Power/Comfort swtich, it changes the timing between shift points, as the spec sheet shows.

I'm still having trouble finding the metric ton package info, but it's still listed in the spec sheets.

As I'm just starting on this spec sheet, anything else need to be fixed or added? I'm still waiting for dimensions and production numbers.

All the early AW4 transmisions came with the power comfort switch. This is not the towing package option. That was standard with the aw4.

Patrick

I would beg to differ, as I have already seen 5 86-88 Comanche's that did not have the power-comfort switch. And it wasn't just the switch that had been took out, but the transmission had no hook-up for the switch :rtft: But cj7xjmj, can you give me reference to where you got the idea that the AW4's came standard with it?

Side note: 86 Comanche-Cherokee's did not come or have the option of the towing package/power-comfort switch.